Add the concept of QueueEnabledVoters to blink scheduler TaskQueue

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_
 
 #include "base/atomicops.h"
 #include "base/macros.h"
 #include "base/synchronization/lock.h"
@@ skipping 342 matching lines @@
   // nagigation. This function does that. Must be called from the main thread.
   void ResetForNavigationLocked();
 
   // Estimates the maximum task length that won't cause a jank based on the
   // current system state. Must be called from the main thread.
   base::TimeDelta EstimateLongestJankFreeTaskDuration() const;
 
   // Report an intervention to all WebViews in this process.
   void BroadcastIntervention(const std::string& message);
 
-  void ApplyTaskQueuePolicy(TaskQueue* task_queue,
-                            const TaskQueuePolicy& old_task_queue_policy,
-                            const TaskQueuePolicy& new_task_queue_policy) const;
+  void ApplyTaskQueuePolicy(
+      TaskQueue* task_queue,
+      TaskQueue::QueueEnabledVoter* task_queue_enabled_voter,
+      const TaskQueuePolicy& old_task_queue_policy,
+      const TaskQueuePolicy& new_task_queue_policy) const;
 
   static const char* ExpensiveTaskPolicyToString(
       ExpensiveTaskPolicy expensive_task_policy);
 
   bool ShouldDisableThrottlingBecauseOfAudio(base::TimeTicks now);
 
   SchedulerHelper helper_;
   IdleHelper idle_helper_;
   std::unique_ptr<TaskQueueThrottler> task_queue_throttler_;
   RenderWidgetSignals render_widget_scheduler_signals_;
 
   const scoped_refptr<TaskQueue> control_task_runner_;
   const scoped_refptr<TaskQueue> compositor_task_runner_;
-  std::set<scoped_refptr<TaskQueue>> loading_task_runners_;
-  std::set<scoped_refptr<TaskQueue>> timer_task_runners_;
+  std::unique_ptr<TaskQueue::QueueEnabledVoter>
+      compositor_task_runner_enabled_voter_;
+
+  using TaskQueueVoterMap =
+      std::map<scoped_refptr<TaskQueue>,
+               std::unique_ptr<TaskQueue::QueueEnabledVoter>>;
+
+  TaskQueueVoterMap loading_task_runners_;
+  TaskQueueVoterMap timer_task_runners_;
   std::set<scoped_refptr<TaskQueue>> unthrottled_task_runners_;
   scoped_refptr<TaskQueue> default_loading_task_runner_;
   scoped_refptr<TaskQueue> default_timer_task_runner_;
 
   // Note |virtual_time_domain_| is lazily created.
   std::unique_ptr<AutoAdvancingVirtualTimeDomain> virtual_time_domain_;
 
   base::Closure update_policy_closure_;
   DeadlineTaskRunner delayed_update_policy_runner_;
   CancelableClosureHolder end_renderer_hidden_idle_period_closure_;
@@ skipping 113 matching lines @@
   PollableThreadSafeFlag policy_may_need_update_;
   base::WeakPtrFactory<RendererSchedulerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererSchedulerImpl);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_RENDERER_SCHEDULER_IMPL_H_